How can we add a custom dropdown in tiny mce using yii2 - yii2

Question

I want to add a custom drop down in tiny mce editor, I am using yii framework and using a yii plugin to integrate the editor

Answer 1

You haven't added any details in your question but since you are a new
bee here and SO Code of Conduct
has been revised to be more nice and humble towards newcomers, so I am
adding the answer for you, do go through the How to Ask a
Question? before posting a
question next time.
You can add the dropdown in the TinyMCE using setup option which takes a callback function with a parameter editor which holds the editor instance, and then you need to call the editor.addButton(label, options) with the options to create the custom dropdown button.
As you have not added any details in the question like what are the options that you are going to display in the dropdown so, I will assume here as usernames from the database in the variable $users.
Steps to Implement
First, we will convert $users array to js array by using yii\helpers\Json::encode().
Iterate that array to create the drop-down options with onclick event to insert the content to the editor.
Use editor.addButton('users',options) to create a button of type dropdown with label users to be later used when initializing the editor toolbar buttons.
Add the following code on top of the view
$usersList = \yii\helpers\Json::encode($users);
$tinyMCECallback = <<< JS
function (editor) {
let usersList = $usersList;
let options = [];
//iterate the user array and create the options with text and
//onclick event to insert the content on click to the editor
$.each(usersList, function(label, mapping) {
options.push({
text: label,
onclick: function() { tinymce.activeEditor.insertContent(label); }
});
});
//add the dropdown button to the editor
editor.addButton('users', {
type: 'menubutton',
text: 'Users',
icon: false,
menu: options
});
}
JS;
Now all you need to do is to pass the $tinyMCECallback to the setup option of the tinyMCE widget, if you are using the active form you code should be like below.
Note: Don't forget to add the users label of the button to the toolbar options, or if you change it in the javascript code change it accordingly in the editor toolbar options otherwise it won't show up
<?php
echo $form->field(
$model, 'body'
)->widget(
TinyMce::class, [
'options' => ['rows' => 10],
'language' => 'en',
'clientOptions' => [
'menubar' => false,
'statusbar' => false,
'toolbar' => "undo redo | users",
'setup' => new \yii\web\JsExpression($tinyMCECallback),
],
]
);
?>